Sonique is a discontinued Windows freeware audio player capable of handling MP3, Ogg Vorbis, Microsoft Windows Media, audio CDs, and more. It fuses a highly stylized aesthetic with a fluid, windowless interface and fully animated menu systems. Additional functionality includes a basic playlist editor, a variety of unique output visualization modes via plug-ins, and a robust control set featuring pitch, balance and amplification adjustment, as well as a 20-band equalizer with spline-based level adjustment. It supports many audio formats, including MP3, MP2, Ogg Vorbis, WAV, MOD, XM, IT, S3M, Audio CD and Windows Media Audio. Further audio and visual formats are playable through various plugins, for example AVI video files. Sonique can also be used to listen to audio streams.

At the time when Sonique was still under development, it was one of the most popular audio players, though had very stiff competition in Nullsoft's Winamp audio player. The major features that made Sonique famous were its audioEnlightenment mpeg decoding engine by Tony Million, its freeform skins, innovative audio visualizations, and a powerful equalizer.

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Slick, if not always smart, Sonique does what it should with some compromises. It supports the essential formats, along with skins and plug-ins, integrated Internet music searching via Lycos (decent) and Hotbot (useless), and links to music resources (parent company Lycos' music channel and the anemic Sonique site). Features are spread through a variety of screens making for a lot of extra clicking; and other little speed bumps tend to crop up. You can't, for example, add directories to your playlist (you must select all songs in the directory). Also vexing are basic usability violations, such as a small and slippery volume knob instead of a slider and an equalizer toggle that isn't sticky between screens.